Pcs- Programming In C# Test For Aptech
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C# is here Variable of reference type store the memory address of other variables in a Stack.
- 1.Variables of this data types store actual values.This value stored in a stack.
- A.
Value Type
- B.
Reference Type.
- 2.Variable of reference type store the memory address of other variables in a Stack.
- A.
True
- B.
False
- 3.The built-in reference data types are : - 2 choices
- A.
Class
- B.
Object
- C.
Delegate
- D.
Array , Interface
- E.
String
- 4.XML Comments begin with :
- A.
Three forward slashes
- B.
Three asterisks
- C.
Double slashes
- 5.Constants are declared for value types rather than for reference types.
- A.
True
- B.
False
- 6.This statement ensure that no other process or threads running in the computer memory can interfere with the code. ensure security and only work with reference type.
- A.
Selection statement
- B.
Iteration statement
- C.
Jump Statement
- D.
Fixed Statement
- E.
Lock Statement
- 7.This statement is required to tell the garbage collector not to move that object during execution.
- A.
Jump Statement
- B.
Lock statement
- C.
Fixed Statement
- D.
Check ed and Unchecked Statement
- 8.Which statements are true?
- A.
The conditional operator works with two operands
- B.
The increment operator works with a single operand
- C.
The bitwise exclusive OR operator compares bits and return 1 if only one of the bits is -1.
- D.
The conditional && operator does not check the seconds expression if the first expression is false
- E.
The compound assignment operators execute from right to left.
- 9.This typeCasting is carried out automatically by the compiler.
- A.
Explicit
- B.
Implicit
- 10.The class which provides useful methods to convert any built-in data type to another built-in data type.
- A.
System.Console.Convert
- B.
System.Convert
- 11.This refers to converting a reference type to a value type.
- A.
Boxing
- B.
UnBoxing
- 12.This is a process for converting a value type to its reference type. this useful to reduce the overhead on the system during execution.
- A.
UnBoxing
- B.
Boxing
- 13.This array is a multi-dimensional array and is reference to as an array of arrays.It considers of multiple arrays where the number of elements within each array can be different.
- A.
Rectangular Array.
- B.
Jagged Array.
- 14.This has improved performance and unequal number of columns.
- A.
Rectangular Array
- B.
Single- dimensional Array
- C.
Jagged Array
- D.
Multi- dimensional Array
- 15.This has many rows and columns.
- A.
Multi- dimensional Array
- B.
Single- dimensional Array
- C.
Rectangular Array
- D.
Jagged Array
- 16.This allows you to create arrays using the CreateInstance() method.
- A.
Array
- B.
New
- C.
Array class
- 17.Method which is used to create Multi- Dimension Array
- A.
Public static Array CreateInstance(type elementType, int length);
- B.
Public static Array CreateArray(type elementType, int length);
- C.
Public static Array CreateInstance(type elementType, int rows, int columns);
- 18.This is the feature of extracting only the required information from object.It's not show all technical details of object.
- A.
Encapsulation
- B.
Inheritance
- C.
Abstraction
- D.
Polymorphism
- 19.Details of what a class contains need not be visible to other classes and objects that use it.
- A.
Encapsulation
- B.
Inheritance
- C.
Polymorphism
- D.
Abstraction
- 20.A method name can be an underscore or the "@" character.
- A.
True
- B.
Fasle
- 21.This variable is a special type that is accessed without using an Object of a class.
- A.
Public variable
- B.
Protect variable
- C.
Static variable
- D.
Final
- 22.This acces modifier allows the class members to be accessible within the class as well as within the derived class.
- A.
Internal
- B.
Protected
- C.
Private
- 23.This access modifier allows the class members to be accessible only within the classes of the same assembly.
- A.
Protected
- B.
Public
- C.
Internal
- 24.This keyword causes arguments to passed in a method by reference.- 2 choices
- A.
Args
- B.
Ref
- C.
Reg
- D.
This
- E.
Out
- 25.The keyword is used to resolve conflicts between variables having same names and to pass the current object as a parameter.
- A.
Out
- B.
This
- C.
Ref
- 26.You cannot use the 'this' keyword with static variables and method.
- A.
True
- B.
False
- 27.A destructor start with the character '@' before the class name.
- A.
True
- B.
False
- 28.Which statements are true?- 3 choices
- A.
Destructors cannot be overloaded or inherited
- B.
Destructors can be overloaded but not be inherited
- C.
Destructors cannot be i explicitly invoked
- D.
Destructors cannot specify access modifiers and take parameters
- E.
May be more than two Destructor in a class
- 29.You can use the 'base' keyword for invoking the static methods of the base class.
- A.
True
- B.
False
- 30.So as to override a particular method of base class in the derived class, we need to declare the method of base class using the keyword.
- A.
Override
- B.
Virtual
- 31.This keyword prevents a class from being inherited by any other class.
- A.
Seales
- B.
Sealed
- C.
Prevents
- D.
Out
- E.
Virtual
- 32.When implementing an interface in a class, you need to implement all the abstract methods declared in the interface.
- A.
True
- B.
False
- 33.Properties cannot be classified as variables but, They can use the ref and out keywords.
- A.
True
- B.
False
- 34.These are defined with two accessors or methods, the get and set accessors.
- A.
Properties
- B.
Fields
- 35.These represent the behavior of an Object.
- A.
Fields
- B.
Properties
- C.
Methods
- 36.These represent characteristic of an Object. Can not have any parameters. and can be overidden but cannot be Overload.
- A.
Properties
- B.
Methods.
- C.
Fields
- 37.Some of most Namespaces of System are:- 4 choices
- A.
System.Collections.
- B.
System.Data
- C.
System.namespaces
- D.
System.Io / System.Net
- E.
System.Diagnostics
- 38.Thsi namespace contains classes and interfaces that define conplex data structure as lists,queues..and dictionaries.
- A.
System.Diagnostics
- B.
System.Io / System.Net
- C.
System.Data
- D.
System.Collections.
- E.
System.Web
- 39.This namespace contains classes that make up ADO.NET architecture.
- A.
System.Web
- B.
System.Collections.
- C.
System.Diagnostics
- D.
System.Io / System.Net
- E.
System.Data
- 40.This namespace contains classes that are used to interact with the system processes.
- A.
System.Data
- B.
System.Diagnostics
- C.
System.Io / System.Net
- D.
System.Web
- 41.This namespace contains classes that enable you to read from and write to data stream and file.
- A.
System.Diagnostics
- B.
System.Web
- C.
System.IO
- D.
System.Net
- 42.This namespace contains classes that you yo create Web-base applications.
- A.
System.Net
- B.
System.Web
- C.
System.Diagnostics
- 43.This namespace provides classes and interfaces that allow communication between the browser and the serevr.
- A.
System.Net
- B.
System.Web
- C.
System.Data
- 44.You can apply access modifier such as public, protected, private .. to namspaces
- A.
True
- B.
False
- 45.Which declaration is used to declare a property.
- A.
Public string property_Name(int parameter) { // body }
- B.
Public string Property_Name { //body. }
- C.
Public string this[int Property_name] { // body }
- D.
Public delegate Property_Name(typeData parameter1, typeData parameter2);
- E.
Public string property_Name() { //body }
- 46.Which declaration is used to declare a indexer.
- A.
Public string [int index]() { //body }
- B.
Public string int[int index] { //body }
- C.
Public string this[int index]() { //body }
- D.
Public string this[int index] { //body }
- 47.Which declaration is used to declare a delegate.
- A.
Public delegates Delagate_Name(int parameter1,int parameter2){}
- B.
Public delegates Delagates_Name(int parameter1,int parameter2);
- C.
Public delegate int Delagates_Name(int parameter1,int parameter2);
- D.
Public delegate float Delagate_Name(int parameter1,int parameter2){}
- 48.Which data structure can not be declared in a namespace ?
- A.
Abstract
- B.
Interface
- C.
Structure
- D.
Enumeration
- E.
Delegate
- 49.Namespaces control scopes of a class.
- A.
True
- B.
False
- 50.These Exception are thrown by the CLR.
- A.
System-level Exceptions
- B.
Application-level Exceptions.
- 51.Returns the exception instance that caused the current Exception.
- A.
Message
- B.
StrackTrace
- C.
InnerException
- 52.This exception is thrown when the result of an arithmetic, casting or conversion operation is to large to be stored in the destination object or variable.
- A.
System.ArithmaticException
- B.
System.InvalidCastException
- C.
System.OverflowException
- D.
System.FormatException
- 53.Customer exceptions can be used to changed the built-in exceptions with modified message.
- A.
True
- B.
False
- 54.Can is Delegate declared within class?
- A.
True
- B.
False
- 55.Which statements are true?
- A.
Delegates are used ti hide static methods.
- B.
Delegates are declared with a return type that may or may not be the same as the return type of the referenced method.
- C.
Delegates are used to invoke overridden methods.
- 56.Events can be declared in :- 2 choices
- A.
Classes
- B.
Methods
- C.
Interfaces
- D.
Absract / Sealed
- E.
Delegates
- 57.Events can be declared as :- 2 choices.
- A.
Classes
- B.
Abstract / Sealed
- C.
Interfaces
- D.
Methods
- E.
Virtual
- 58.Events are implemented using delegates.
- A.
True
- B.
False
- 59.Steps for implementing events in C# are: 1. Create the event using the delegate. 2. Subscribe to listen and handle the event. 3. Define a public delegate for the event 4. Raise the event.
- A.
1-2-3-4
- B.
1-3-4-2
- C.
3-1-2-4
- D.
3-1-4-2
- 60.How to declare Event?
- A.
delegate delegate_name (parameters); event ;
- B.
delegate delegate_name (parameters); event ;
- C.
event ;
- 61.Which statement are true for Delegate?
- A.
Public delegate int Add_Dele(int t1, int t2); class Delegate_Event { //public Add_Dele event dele_Event; public int add(int a,int b) { return (a+b); } public void Main(string[] args) { int v1 = 5; int v2 = 10; Add_Dele objDel = new Add_Dele(add); objDel(v1,v2); Console.WriteLine("Value1 + Value2 = " +objDel(v1,v2)); } }
- B.
Public delegate int Add_Dele(int t1, int t2); class Delegate_Event { //public Add_Dele event dele_Event; static int add(int a,int b) { return (a+b); } static void Main(string[] args) { int v1 = 5; int v2 = 10; Add_Dele objDel = new Add_Dele(add); objDel(v1,v2); Console.WriteLine("Value1 + Value2 = " +objDel(v1,v2)); } }
- 62.Which are true?
- A.
Event can be declared in an Interface.
- B.
Events can are declared as Abstract or Sealed
- 63.Represents a generic collection consisting of the key and value pairs.
- A.
ICollection
- B.
IDictipnary
- C.
IEnumerator
- 64.Which statement are true?
- A.
Generics are used to work with multiple data type simultaneously.
- B.
Generics are verified at run-time.
- C.
Generics are declared with or without a type parameter
- D.
Generics can be implemented without a need for explicit or implicit casting.
- 65.Which are true?- 2 choices
- A.
The get accessor can be executed when the property is assigned a new value
- B.
The get accessor can be declared using a parameter called value.
- C.
The get accessor can be executed by referring to the name of the property.
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